Answer:
focal length depends on the radius of curvature, the refractive index of lens material, and the medium's refractive index in which the lens is placed
Answer:
electricity consumption in United states was about 3.9 trillion kilolwatthours(kWh) in 2019 electricity is an essential part of morden life
Answer:
Power = 1200 [W].
Explanation:
The efficiency of an electrical equipment is defined as the relationship between the power realized, over the power that is consumed. For this case, they give us the data of consumed power and efficiency in this way we can calculate the power that the equipment performs.
![Efficency=\frac{Power_{done}}{P_{consumed}}\\0.8 = \frac{Power_{done}}{1500} \\Power_{done}=1500*0.8\\Power_{done} = 1200 [W]](https://tex.z-dn.net/?f=Efficency%3D%5Cfrac%7BPower_%7Bdone%7D%7D%7BP_%7Bconsumed%7D%7D%5C%5C0.8%20%3D%20%5Cfrac%7BPower_%7Bdone%7D%7D%7B1500%7D%20%20%5C%5CPower_%7Bdone%7D%3D1500%2A0.8%5C%5CPower_%7Bdone%7D%20%3D%201200%20%5BW%5D)
This means that of the 1500 [W], 1200 [W] are actually used to get the job done. This is established by means of the first law of thermodynamics.
<h3>
<u>Correction</u><u>:</u><u>-</u></h3>
Prove that v² = u² + 2as .
<h3>
<u>Solution</u><u>:</u><u>-</u></h3>
From first equation of motion,
v = u + at
=> at = v - u
=> t = v - u / a
From the second equation of motion, we have
s = ut + 1/2at²
Putting the value of t in above equation , we get:
s = u ( v - u /a ) + 1/2 a ( v - u/a )²
s = uv - u² / a + a( v² + u² - 2uv / 2a²)
s = uv - u² / a + v² + u² - 2uv / 2a
s = 2uv - 2u² + v² + u² - 2uv / 2a
2as = v² - u²
Answer:
27
Explanation:
The formula to find the volume of a cube is Volume=height cubed(or to the power of 3) so you would replace height with 3cm and get the equation Volume= 3 to the power of 3. So 3 x 3 x 3 = 27. So your answer would be:
27